CN217590483U

CN217590483U - Direct-drive electric cylinder

Info

Publication number: CN217590483U
Application number: CN202221830606.4U
Authority: CN
Inventors: 陈刚
Original assignee: Sichuan Dinghong Zhidian Equipment Technology Co ltd
Current assignee: Sichuan Dinghong Zhidian Equipment Technology Co ltd
Priority date: 2022-07-15
Filing date: 2022-07-15
Publication date: 2022-10-14
Anticipated expiration: 2032-07-15

Abstract

The utility model relates to a directly drive electric jar, locate lead screw outlying nut including motor element, lead screw and cover, motor element includes the frame, connects in the end cover of frame one end and connects in inside motor stator, electric motor rotor of frame, connects in the inside rotor shaft of electric motor rotor, the rotor shaft is passed to the one end of lead screw, the tight cover that expands has been cup jointed to the periphery of rotor shaft, the tight cover that expands is used for compressing tightly the rotor shaft to the lead screw, frame, end cover respectively with be connected through the bearing between the lead screw, be equipped with oil filler point and the oil extraction hole with the bearing intercommunication on frame, the end cover respectively. The utility model discloses the processing and the equipment of well lead screw and rotor shaft are convenient nimble more, and convenient to detach simultaneously makes things convenient for the dimension to protect, can also ensure the relation of connection of its high strength, and through set up oiling, oil extraction and trapped fuel structure at the bearing end, can ensure the lubricated effect of bearing, reduce the friction loss of bearing.

Description

Direct-drive electric cylinder

Technical Field

The utility model relates to an electronic jar technical field specifically is a directly drive electric jar.

Background

The electric cylinder is a modularized product which integrally designs the servo motor and the lead screw, the rotary motion of the servo motor is converted into linear motion, the lead screw is driven to rotate through the motor, and the reciprocating linear motion is converted through the nut. The torque transmission from a motor to a lead screw in the existing electric cylinder usually adopts transmission modes such as gears, planetary reducers or synchronous belts, the transmission efficiency is low, and the whole weight and the size of the electric cylinder are heavy. In the invention patent with the publication number of CN111786495A and the name of 'a short-zero-length electric cylinder device', the invention discloses a technical scheme for directly connecting a motor rotor and a screw rod shaft, firstly, the technical scheme adopts a mode of interference fit of one end of the screw rod and a central through hole of the rotor, and the fit mode usually requires extremely high processing precision, is inconvenient to adjust and disassemble and has higher maintenance cost; secondly, two sets of rolling bearings in the technical scheme rotate for a long time and are easy to generate friction loss.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a directly drive electric jar to solve the technical problem who mentions in the above-mentioned background art.

In order to achieve the above purpose, the utility model provides a following technical scheme: the utility model provides a directly drive electric cylinder, locates lead screw outlying nut including motor element, lead screw and cover, motor element includes the frame, connects in the end cover of frame one end and connects in inside motor stator, the electric motor rotor of frame, connects in the inside rotor shaft of electric motor rotor, the rotor shaft sets up to hollow structure, the hollow structure of rotor shaft is passed to the one end of lead screw, the peripheral of rotor shaft has cup jointed the tight cover that expands, the tight cover that expands is used for compressing tightly the rotor shaft to the lead screw, frame, end cover are connected through the bearing between respectively and the lead screw, be equipped with oil filler point and the oil drain hole with the bearing intercommunication on frame, the end cover respectively. Through the technical scheme of the utility model, make the processing and the equipment of lead screw and rotor shaft convenient more nimble, convenient to detach simultaneously, convenient dimension is protected, can also ensure the relation of connection of its high strength, and through set up oiling, oil extraction at the bearing end, can ensure the lubricated effect of bearing, reduce the friction loss of bearing.

Preferably, the bearing may be a self-aligning thrust roller bearing, an angular contact ball bearing, or a thrust ball bearing.

Preferably, the bearing has oil reservoirs connected to both ends thereof, the oil reservoirs being configured to block grease in the bearing, and the grease is prevented from being thrown out by the oil reservoirs when the bearing rotates, thereby ensuring a bearing lubrication effect and reducing a friction loss of the bearing.

Preferably, the motor assembly further comprises a cooling portion for dissipating heat from the motor and the bearing.

As the preferred scheme, the cooling part comprises a liquid inlet and a liquid outlet which are respectively connected to the upper end and the lower end of the machine base and a cooling liquid channel arranged inside the machine base, and the cooling liquid channel is respectively communicated with the liquid inlet and the liquid outlet.

Preferably, the cooling part is a heat radiation fan connected to the base.

As a preferred scheme, one end of the nut is connected with a piston rod, the peripheries of the screw rod and the piston rod are sleeved with a cylinder barrel, and the cylinder barrel is connected to the base.

As a preferred scheme, the direct-drive electric cylinder further comprises a brake assembly, the brake assembly comprises a power-off brake connected to the end cover and two limit switches connected to the cylinder barrel, the limit switches respectively correspond to two stroke end points of the piston rod, and the stroke of the piston rod can be ensured to be within a preset range through the cooperation of the power-off brake and the limit switches, and automatic contracting brake protection can be realized if the stroke is excessive or the power is cut off.

Preferably, the brake assembly further comprises two anti-collision rings connected to two ends of the lead screw respectively, the anti-collision rings form mechanical limiting and complement with the power-off brake, and when the power-off brake fails or runaway overshoot occurs, the anti-collision rings can be used for blocking movement of the nut so as to protect components such as the lead screw and the like, and safety is improved.

As a preferred scheme, the direct-drive electric cylinder further comprises an encoder connected to the tail of the end cover, and the lead screw is connected to the encoder.

Compared with the prior art, the beneficial effects of the utility model are that:

1) The utility model adopts the integrated design of directly connecting the rotor shaft with the lead screw, avoids the transmission modes such as gears and synchronous belts adopted in the traditional electric cylinder structure, improves the transmission efficiency and simultaneously leads the direct-drive electric cylinder of the embodiment to have lighter weight and smaller volume;

2) By adopting the mode of connecting the rotor shaft and the lead screw by the expansion sleeve, the lead screw and the rotor shaft are more convenient and flexible to process and assemble, excessive processing precision is not needed, and meanwhile, the device is convenient to disassemble and maintain, can also ensure the high-strength connection relationship, and is stable and reliable;

3) The bearing end is provided with the oil injection, oil discharge and oil storage structure, so that the lubricating effect of the bearing can be ensured, and the friction loss of the bearing is reduced;

4) By arranging the cooling part and combining the cooling mode of cooling liquid circulation, the heat of the motor and the bearing can be dissipated in time, and a good heat dissipation effect is achieved;

5) The cooperation of the electric brake and the limit switch is interrupted through the brake assembly, so that the overall safety of the equipment can be improved, and the overtravel is prevented; through crashproof loop structure, can further promote the security with the complementary protection that the outage stopper formed.

Drawings

Fig. 1 is a cross-sectional view of the direct-drive electric cylinder of the present invention;

the various reference numbers in the figures mean:

1. a lead screw; 2. a nut; 3. a machine base; 4. a motor stator; 5. a motor rotor; 6. expanding and tightening the sleeve; 7. a piston rod; 8. a cylinder barrel; 9. an end cap; 10. a bearing; 11. an oil filler hole; 12. an oil reservoir; 13. a liquid inlet; 14. a liquid outlet; 15. a coolant passage; 16. a power-off brake; 17. a limit switch; 18. an anti-collision ring; 19. an encoder; 20. a rotor shaft.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

Referring to fig. 1, this embodiment discloses a directly drive electric jar, locate lead screw 1 outlying nut 2 including motor element, lead screw 1 and cover, motor element includes frame 3 and connects in the inside motor stator 4 of frame 3, connect in the inside motor rotor 5 of motor stator 4, connect in the rotor shaft 20 of motor rotor 5 internal surface, lead screw 1's one end is connected to rotor shaft 20, the back of main cable circular telegram in the motor element, motor stator 4 produces the rotating magnetic field, be inlayed with the permanent magnet in the motor rotor 5, motor rotor 5 rotates under the magnetic field effect and drives rotor shaft 20, and then drive lead screw 1 rotatory, promote nut 2 and carry out reciprocating linear motion, realize motor rotary motion to nut 2 linear motion's high-efficient conversion. In this embodiment, rotor shaft 20 sets up to hollow structure, and rotor shaft 20's hollow structure is passed to the one end of lead screw 1, has cup jointed the tight cover 6 that expands in rotor shaft 20's periphery, and this tight cover 6 that expands sets up in the one end that lead screw 1 wore out, compresses tightly rotor shaft 20 in lead screw 1's surface through the tight cover 6 that expands. In the embodiment, the integrated design that the rotor shaft 20 is directly connected to the lead screw 1 and directly drives the lead screw to rotate is adopted, the transmission modes of gears, synchronous belts and the like adopted in the traditional electric cylinder structure are avoided, and the direct-drive electric cylinder of the embodiment has lighter weight and more exquisite volume while the transmission efficiency is improved; furthermore, through adopting the connected mode of the expansion sleeve 6, the processing and the assembly of the screw rod 1 and the rotor shaft 20 in the embodiment are more convenient and flexible, the processing precision is not required to be too high, the disassembly is convenient, meanwhile, the high-strength connection relation can also be ensured, and the stability and the reliability are realized. In this embodiment, 2 end connections of nut have piston rod 7, drive the reciprocating motion of piston rod 7 through nut 2, and the peripheral cover in lead screw 1, piston rod 7 is equipped with cylinder 8, 8 fixed connection of cylinder to frame 3, in this embodiment, cylinder 8 and frame 3 all can adopt the aluminum alloy material, can also strengthen the radiating effect when further reducing weight. It will be appreciated that in this embodiment the screw 1 is divided into a first end and a second end, the first end being provided with an outer surface thread structure, which is disposed in the cylinder 8, and the second end being provided with a smooth outer surface without threads, which is disposed in the housing 3 and is connected to the rotor shaft 20. In the motor assembly, the motor may be a dc motor, an asynchronous motor, a disc motor, a reluctance motor, etc., and is not limited herein. In a preferred embodiment, the housing 3 is further provided with a mounting hole (not shown) for mounting a wear-resistant metal sleeve, preferably a steel or copper sleeve, at an end of the housing 3 near the cylinder 8, wherein the wear-resistant metal sleeve is capable of withstanding the reaction force of the electric cylinder by being fitted with the wear-resistant steel or copper sleeve.

Further, the motor assembly further comprises an end cover 9 connected to the base 3, bearings 10 are respectively installed at the front end of the base 3 and inside the end cover 9, the base 3 and the end cover 9 are respectively connected with the lead screw 1 through the bearings 10, and the bearings 10 bear radial force and simultaneously play a supporting role. The bearing 10 may be a self-aligning thrust roller bearing, an angular ball bearing, a thrust ball bearing, or the like, and is preferably a self-aligning thrust roller bearing capable of receiving a large thrust. Furthermore, an oil filling hole 11 and an oil discharge hole are respectively arranged on the base 3 and the end cover 9 corresponding to the position of the bearing 10, the oil filling hole 11 and the oil discharge hole are respectively communicated with the bearing 10, new lubricating grease is periodically supplemented for the bearing 10 through the oil filling hole 11, old lubricating grease can be discharged through the oil discharge hole, the lubricating environment of the bearing 10 can be improved through the oil filling hole 11 and the oil discharge hole, and the service life of the bearing 10 is prolonged. In a preferred embodiment, oil reservoirs 12 for blocking grease in the bearing 10 are connected to both ends of the bearing 10, respectively, so that the grease is not easily thrown out when the bearing 10 rotates, thereby ensuring the lubricating effect of the bearing 10 and reducing the friction loss of the bearing 10. In this embodiment, the oil reservoir 12 is of an oil seal ring structure.

In another embodiment, the motor assembly further comprises a cooling portion connected to the housing 3 for dissipating heat of the motor assembly as a whole. The cooling portion further includes inlet 13 and liquid outlet 14 that are connected to frame 3 upper and lower both ends respectively and sets up in the coolant liquid passageway 15 of frame 3 inside and inlet 13 liquid outlet 14 intercommunication, and inlet 13 and liquid outlet 14 are connected with outside cooler respectively, form coolant liquid circulation route through inlet 13, coolant liquid passageway 15 and liquid outlet 14, can in time take away the heat that motor work produced. In other embodiments, the cooling portion may further use a heat dissipation fan to dissipate heat of the motor assembly. In a preferred embodiment, temperature sensors are connected to the motor windings and the bearings 10, respectively, for monitoring the temperature in real time.

In one embodiment, the direct-drive electric cylinder further comprises a brake assembly for ensuring the safety of the direct-drive electric cylinder, specifically, the brake assembly comprises a power-off brake 16 connected to the tail of the end cover 9 and two limit switches 17 connected to the cylinder barrel 8, the two limit switches 17 respectively correspond to two stroke end points of the piston rod 7, and the stroke of the piston rod 7 can be ensured to be within a preset range through the cooperation of the power-off brake 16 and the limit switches 17, for example, automatic contracting brake protection can be performed when the stroke is excessive or the power is cut off. In a preferred embodiment, the brake assembly further comprises two anti-collision rings 18 respectively connected to two ends of the screw 1, the anti-collision rings 18 form a mechanical limit and complement the power-off brake 16, and when the power-off brake 16 fails or runaway overshoot occurs, the anti-collision rings 18 can be used for blocking the movement of the nut 2 so as to protect the screw 1 and other components and improve safety.

In one embodiment, the direct-drive electric cylinder further comprises an encoder 19 connected to the tail portion of the end cover 9, and the encoder 19 is arranged at the side end of the power-off brake 16 and connected to one end, penetrating out of the electronic rotor, of the screw rod 1 for achieving automatic control of the direct-drive electric cylinder.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It should be understood by those skilled in the art that the present invention is not limited by the above embodiments, and the description in the above embodiments and the description is only preferred examples of the present invention, and is not intended to limit the present invention, and that the present invention can have various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications all fall into the scope of the claimed invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a directly drive electric cylinder, locates lead screw (1) outlying nut (2) including motor element, lead screw (1) and cover, motor element includes frame (3), connects in end cover (9) of frame (3) one end and connects in inside motor stator (4), motor rotor (5) of frame (3), connects in the inside rotor shaft (20) of motor rotor (5), its characterized in that, rotor shaft (20) set up to hollow structure, the one end of lead screw (1) is passed the hollow structure of rotor shaft (20), the periphery of rotor shaft (20) has cup jointed the tight cover of expanding (6), the tight cover of expanding (6) are used for compressing tightly rotor shaft (20) to lead screw (1), frame (3), end cover (9) are connected through bearing (10) respectively with lead screw (1), be equipped with oil filler point (11) and the oil drain hole that communicate with bearing (10) on frame (3), end cover (9) respectively.

2. The direct-drive electric cylinder as claimed in claim 1, characterized in that the bearing (10) can be a self-aligning thrust roller bearing, an angular contact ball bearing or a thrust ball bearing.

3. The direct-drive electric cylinder as recited in claim 1, characterized in that oil reservoirs (12) are connected to both side ends of the bearing (10), and the oil reservoirs (12) are used for blocking grease in the bearing (10).

4. The direct drive electric cylinder as set forth in claim 1 wherein said motor assembly further comprises a cooling portion for dissipating heat.

5. The direct-drive electric cylinder as recited in claim 4, characterized in that the cooling portion comprises a liquid inlet (13) and a liquid outlet (14) connected to the upper and lower ends of the base (3), respectively, and a cooling liquid channel (15) disposed inside the base (3), the cooling liquid channel (15) being communicated with the liquid inlet (13) and the liquid outlet (14), respectively.

6. Direct drive electric cylinder according to claim 5, characterized in that the cooling section is a radiator fan connected to the machine base (3).

7. The direct-drive electric cylinder as recited in claim 1, characterized in that one end of the nut (2) is connected with a piston rod (7), the peripheries of the screw rod (1) and the piston rod (7) are sleeved with a cylinder barrel (8), and the cylinder barrel (8) is connected to the base (3).

8. Direct drive electric cylinder according to claim 7, characterized in that it further comprises a brake assembly comprising a power-off brake (16) connected to the end cap (9) and two limit switches (17) connected to the cylinder barrel (8), said limit switches (17) corresponding to the two end points of travel of the piston rod (7), respectively.

9. The direct drive electric cylinder according to claim 8, characterized in that the brake assembly further comprises two anti-collision rings (18) connected to both ends of the screw (1), respectively.

10. The direct drive electric cylinder as claimed in any one of claims 1 to 9 further comprising an encoder (19) connected to the tail of the end cap (9), the lead screw (1) being connected to the encoder (19).